Every soul that has been projected as a ray from the spirit, must pass through all these three spheres. Sometimes it remains in one sphere longer than in another. It remains or it goes further, just as some of us in art, in science, in learning, in the pursuit of knowledge, go so far and no further. So it is with souls; those which are satisfied in one sphere remain there; they may behave like any creature of the lower creation would -- eat, drink, and make merry and be quite happy. There are others who feel uncomfortable until they have penetrated into another sphere where they are more contented; some are not satisfied in that sphere either and look for another sphere.